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java.lang.Objectorg.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
org.eclipse.persistence.jpa.jpql.model.query.AbstractEncapsulatedExpressionStateObject
org.eclipse.persistence.jpa.jpql.model.query.AbstractDoubleEncapsulatedExpressionStateObject
org.eclipse.persistence.jpa.jpql.model.query.NullIfExpressionStateObject
public class NullIfExpressionStateObject
NULLIF returns the first expression if the two expressions are not equal. If
the expressions are equal, NULLIF returns a null value of the type of the
first expression.
NULLIF is equivalent to a searched CASE expression in
which the two expressions are equal and the resulting expression is NULL.
Returns the same type as the first expression.
nullif_expression::= NULLIF(scalar_expression, scalar_expression)
NullIfExpression| Field Summary |
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| Fields inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractDoubleEncapsulatedExpressionStateObject |
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FIRST_STATE_OBJECT_PROPERTY, SECOND_STATE_OBJECT_PROPERTY |
| Constructor Summary | |
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NullIfExpressionStateObject(StateObject parent)
Creates a new NullIfExpressionStateObject. |
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NullIfExpressionStateObject(StateObject parent,
StateObject firstStateObject,
StateObject secondStateObject)
Creates a new NullIfExpressionStateObject. |
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NullIfExpressionStateObject(StateObject parent,
java.lang.String firstJpqlFragment,
java.lang.String secondJpqlFragment)
Creates a new NullIfExpressionStateObject. |
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| Method Summary | |
|---|---|
void |
accept(StateObjectVisitor visitor)
Visits this StateObject by the given visitor. |
NullIfExpression |
getExpression()
Returns the actual parsed object if this StateObject representation of the JPQL query
was created by parsing an existing JPQL query. |
protected java.lang.String |
getFirstQueryBNFId()
Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the first encapsulated expression. |
java.lang.String |
getIdentifier()
Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject. |
protected java.lang.String |
getSecondQueryBNFId()
Returns the unique identifier of the BNF that will be used to parse a JPQL fragment as the second encapsulated expression. |
void |
setExpression(NullIfExpression expression)
Keeps a reference of the parsed object object, which should only be
done when this object is instantiated during the conversion of a parsed JPQL query into
StateObjects. |
| Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractDoubleEncapsulatedExpressionStateObject |
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addChildren, getFirst, getSecond, hasFirst, hasSecond, isEquivalent, parseFirst, parseSecond, setFirst, setSecond, toTextEncapsulatedExpression |
| Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractEncapsulatedExpressionStateObject |
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toTextInternal |
| Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject |
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acceptUnknownVisitor, acceptUnknownVisitor, addProblems, addPropertyChangeListener, areEquivalent, buildProblem, buildProblem, buildStateObject, buildStateObjects, checkParent, children, decorate, equals, findIdentificationVariable, firePropertyChanged, getChangeSupport, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getParent, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, initialize, isDecorated, parent, parent, parent, removePropertyChangeListener, setExpression, setParent, toString, toString, toStringInternal, toStringItems, toText |
| Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public NullIfExpressionStateObject(StateObject parent)
NullIfExpressionStateObject.
parent - The parent of this state object, which cannot be null
java.lang.NullPointerException - The given parent cannot be nullpublic NullIfExpressionStateObject(StateObject parent, StateObject firstStateObject, StateObject secondStateObject)
NullIfExpressionStateObject.
parent - The parent of this state object, which cannot be nullfirstStateObject - The StateObject representing the first expressionsecondStateObject - The StateObject representing the second expression
java.lang.NullPointerException - The given parent cannot be nullpublic NullIfExpressionStateObject(StateObject parent, java.lang.String firstJpqlFragment, java.lang.String secondJpqlFragment)
NullIfExpressionStateObject.
parent - The parent of this state object, which cannot be nullfirstJpqlFragment - The string representation of the first encapsulated expression to
parse and to convert into a StateObject representationsecondJpqlFragment - The string representation of the second encapsulated expression to
parse and to convert into a StateObject representation
java.lang.NullPointerException - The given parent cannot be null| Method Detail |
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public void accept(StateObjectVisitor visitor)
StateObject by the given visitor.
visitor - The visitor to visit this objectpublic NullIfExpression getExpression()
StateObject representation of the JPQL query
was created by parsing an existing JPQL query.
getExpression in interface StateObjectgetExpression in class AbstractDoubleEncapsulatedExpressionStateObjectStateObject
or null when the JPQL query is manually created (i.e. not from a string)protected java.lang.String getFirstQueryBNFId()
getFirstQueryBNFId in class AbstractDoubleEncapsulatedExpressionStateObjectpublic java.lang.String getIdentifier()
AbstractSingleEncapsulatedExpressionStateObject.
getIdentifier in class AbstractEncapsulatedExpressionStateObjectprotected java.lang.String getSecondQueryBNFId()
getSecondQueryBNFId in class AbstractDoubleEncapsulatedExpressionStateObjectpublic void setExpression(NullIfExpression expression)
parsed object object, which should only be
done when this object is instantiated during the conversion of a parsed JPQL query into
StateObjects.
expression - The parsed object representing a NULLIF
expression
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